medium 5.3

CVE-2024-9398 json

By checking the result of calls to `window.open` with specifically set protocol handlers, an attacker could determine if the application wh…

published 2024-10-01 2 y ago modified 2026-10-08 31 d ago also EUVD-2024-49913

cvss: 5.3; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.6%; EPSS 0.6% chance of exploitation in 30 days, percentile 47%
public exploits: 0; none known

By checking the result of calls to `window.open` with specifically set protocol handlers, an attacker could determine if the application which implements that protocol handler is installed. This vulnerability affects Firefox < 131, Firefox ESR < 128.3, Thunderbird < 128.3, and Thunderbird < 131.

Patch / fix

fixed in 3 distros 7

Mozilla Firefox 131
Mozilla Firefox ESR 128.3
Mozilla Thunderbird 128.3, 131

debian ubuntu red hat suse opensuse almalinux rocky linux

thunderbird Debian 14, Debian 13 1:128.3.0esr-1

debian advisories DEBIAN-CVE-2024-9398

firefox Ubuntu 20.04 LTS 131.0+build1.1-0ubuntu0.20.04.1
thunderbird Ubuntu 22.04 LTS 1:140.7.1+build1-0ubuntu0.22.04.1

ubuntu advisories UBUNTU-CVE-2024-9398

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

thunderbird RHEL 8 128.3.0-1.el8_10
firefox RHEL 8 128.3.0-1.el8_10
thunderbird RHEL 9 128.3.0-1.el9_4
thunderbird RHEL 8.8 EUS 128.3.1-1.el8_8
thunderbird RHEL 8.6 TUS, RHEL 8.6 E4S, RHEL 8.6 AUS 128.3.0-1.el8_6
thunderbird RHEL 8.2 AUS 128.3.0-1.el8_2
thunderbird RHEL 8.4 TUS, RHEL 8.4 E4S, RHEL 8.4 AUS 128.3.0-1.el8_4
thunderbird RHEL 9.0 E4S 128.3.0-1.el9_0

red hat advisories RHSA-2024:8166 RHSA-2024:8169 RHSA-2024:7856 RHSA-2024:7854 RHSA-2024:7855 RHSA-2024:7853

MozillaThunderbird SLE Workstation Extension 15 SP6, SLE Workstation Extension 15 SP5, SLE Module for Package Hub 15 SP6 +3 more 128.3.0-150200.8.182.1
MozillaFirefox SLES for SAP 15 SP4, SLES for SAP 15 SP3, SLES for SAP 15 SP2 +12 more 128.3.1-150200.152.155.1
MozillaFirefox SLES for SAP 12 SP5, SLES 12 SP5, SLE Software Development Kit 12 SP5 128.3.1-112.231.1
MozillaFirefox SLES for SAP 15 SP4, SLES for SAP 15 SP3, SLES for SAP 15 SP2 +12 more 128.3.0-150200.152.152.1
MozillaFirefox SLES for SAP 12 SP5, SLES 12 SP5, SLE Software Development Kit 12 SP5 128.3.0-112.228.1

suse advisories SUSE-SU-2024:3629-1 SUSE-SU-2024:3614-1 SUSE-SU-2024:3603-1 SUSE-SU-2024:3519-1 SUSE-SU-2024:3518-1

firefox-esr openSUSE Tumbleweed 128.5.1-1.1
mozjs128 openSUSE Tumbleweed 128.3.1-1.1
MozillaThunderbird openSUSE Tumbleweed 128.3.1-1.1
MozillaFirefox openSUSE Tumbleweed 131.0-1.1

opensuse advisories openSUSE-SU-2024:14572-1 openSUSE-SU-2024:14397-1 openSUSE-SU-2024:14394-1 openSUSE-SU-2024:14385-1

thunderbird AlmaLinux 8 128.3.0-1.el8_10.alma.1
firefox AlmaLinux 8 128.3.0-1.el8_10.alma.1
thunderbird AlmaLinux 9 128.3.0-1.el9_4.alma.1

almalinux advisories ALSA-2024:7699 ALSA-2024:7700 ALSA-2024:7552

thunderbird Rocky Linux 8 128.3.0-1.el8_10
firefox Rocky Linux 8 128.3.0-1.el8_10

rocky linux advisories RLSA-2024:7699 RLSA-2024:7700

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2024-9398 updated 2026-11-07 cvss 4.3

firefox: thunderbird: External protocol handlers could be enumerated via popups

Red Hat Enterprise Linux 6 firefox, thunderbird Red Hat Enterprise Linux 7 thunderbird
affected: no fix planned “Out of support scope”
Red Hat Enterprise Linux 9 firefox, firefox-x11, firefox-flatpak-container, thunderbird-flatpak-container Red Hat Enterprise Linux 10 firefox, thunderbird
affected: no fix available
Red Hat Enterprise Linux AppStream (v. 8) firefox 128.3.0-1.el8_10, thunderbird 128.3.0-1.el8_10
fixed: vendor fix RHSA-2024:7700
Red Hat Enterprise Linux AppStream (v. 9) thunderbird 128.3.0-1.el9_4
fixed: vendor fix RHSA-2024:7552
Red Hat Enterprise Linux AppStream AUS (v. 8.2) firefox 128.3.0-1.el8_2, thunderbird 128.3.0-1.el8_2
fixed: vendor fix RHSA-2024:7646
Red Hat Enterprise Linux AppStream AUS (v.8.4) firefox 128.3.0-1.el8_4, thunderbird 128.3.0-1.el8_4
fixed: vendor fix RHSA-2024:7703
Red Hat Enterprise Linux AppStream AUS (v.8.6) firefox 128.3.0-1.el8_6, thunderbird 128.3.0-1.el8_6
fixed: vendor fix RHSA-2024:7704
Red Hat Enterprise Linux AppStream E4S (v.8.4) firefox 128.3.0-1.el8_4, thunderbird 128.3.0-1.el8_4
fixed: vendor fix RHSA-2024:7703

show 7 more

Red Hat Enterprise Linux AppStream E4S (v.8.6) firefox 128.3.0-1.el8_6, thunderbird 128.3.0-1.el8_6
fixed: vendor fix RHSA-2024:7704
Red Hat Enterprise Linux AppStream E4S (v.9.0) firefox 128.3.0-1.el9_0, thunderbird 128.3.0-1.el9_0
fixed: vendor fix RHSA-2024:7621
Red Hat Enterprise Linux AppStream EUS (v.8.8) firefox 128.3.0-1.el8_8, thunderbird 128.3.1-1.el8_8
fixed: vendor fix RHSA-2024:7842
Red Hat Enterprise Linux AppStream EUS (v.9.2) firefox 128.3.0-1.el9_2, firefox-x11 128.3.0-1.el9_2, thunderbird 128.3.0-1.el9_2
fixed: vendor fix RHSA-2024:7622
Red Hat Enterprise Linux AppStream TUS (v.8.4) firefox 128.3.0-1.el8_4, thunderbird 128.3.0-1.el8_4
fixed: vendor fix RHSA-2024:7703
Red Hat Enterprise Linux AppStream TUS (v.8.6) firefox 128.3.0-1.el8_6, thunderbird 128.3.0-1.el8_6
fixed: vendor fix RHSA-2024:7704
Red Hat Enterprise Linux Server (v. 7 ELS) firefox 128.3.0-1.el7_9
fixed: vendor fix RHSA-2024:7702

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation: none
Automatable: yes
Technical impact: partial
Assessed: 19 mo ago (2025-03-18)

Exploit prediction

0.57% chance of exploitation in the next 30 days, higher than 47% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CISA ADP	3.1	5.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
NVD	3.1	5.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CNA	3.1	5.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Affected products

Mozilla Firefox
Mozilla Firefox ESR
Mozilla Thunderbird

Classification

Weakness

CWE-203 Observable Discrepancy

References

mozilla.org /security/advisories/mfsa2024-46/
vendor-advisory
mozilla.org /security/advisories/mfsa2024-47/
vendor-advisory
mozilla.org /security/advisories/mfsa2024-49/
vendor-advisory
mozilla.org /security/advisories/mfsa2024-50/
vendor-advisory
bugzilla.mozilla.org /show_bug.cgi?id=1881037
issue-tracking, permissions-required

Sources

CVE List CVE-2024-9398
NVD CVE-2024-9398

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.

Summary